The low ridge in the left foreground is the vegetation-covered surface of a SW-flank lava flow erupted in 1867. Lava effusion began on the SW flank on December 14. Explosive activity continued, producing ashfall over the city of Usulután (20 km to the SW) and damaging tobacco plantations. The volcano was reported to be in activity again on February 2 and was particularly active on February 16. Lava fountains produced extensive scoria deposits that mantled the flow, causing it to be more vegetated than older flows.

Photo by Lee Siebert, 1999 (Smithsonian Institution).

This image is made available under the Public Domain Dedication CC0 license, but proper attribution is appreciated.

San Miguel